15. Mariah Carey
After spending much of 2011 parading her twin babies around on Twitter, Carey announced her intention to refocus on music in the new year. Apart from a few one-off performances, however, she's got nothing to show for it yet. But it won't take much for the best-selling artist of the SoundScan era to shoot back up our rankings with her next release.—Jeff Royer
(Photo: Abdeljalil Bounhar, AP Images)
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